If I run the following PHP code on the command line, I get the expected result:
php -r 'var_dump(ldap_connect("ldaps://ldaps.example.com", 636));' resource(4) of type (ldap link)
However, if I put this in a PHP script
<?php ldap_connect("ldaps://ldaps.example.com", 636); ?>
Apache disconnects the connection, for example, this is what cURL returns if I hit the script from the command line:
curl http://example.com/ldap_test.php curl: (52) Empty reply from server
Apache access_log never shows hit on this page, and error_log is empty.
I know that the LDAP server is working, as I tested this on two other servers. I am working on a Joyent accelerator running PHP 5.2.9 and Apache. Does anyone know why Apache is choking on this?
Update:
Today I debugged Apache using GDB when running the script problem. When the script hits the ldap_connect () line, I get the following in GDB:
Program received signal SIGSEGV, Segmentation fault. 0xfe94b8bb in _free_unlocked () from /lib/libc.so.1
I'm not sure what segfault is causing, but at least I know that Apache is actually crashing.
Here is the complete backtrace:
Breakpoint 1, 0x08094417 in ap_process_request () (gdb) c Continuing. Program received signal SIGSEGV, Segmentation fault. 0xfe94b8bb in _free_unlocked () from /lib/libc.so.1 (gdb) where #0 0xfe94b8bb in _free_unlocked () from /lib/libc.so.1 #1 0xfe94b86f in free () from /lib/libc.so.1 #2 0xfde2d7e8 in ldap_x_free () from /usr/lib/libldap.so.5 #3 0xfde3f78b in ldap_free_urldesc () from /usr/lib/libldap.so.5 #4 0xfd0943d9 in ldap_free_urllist () from /opt/local/lib/libldap-2.4.so.2 #5 0xfd087191 in ldap_ld_free () from /opt/local/lib/libldap-2.4.so.2 #6 0xfd07ce8f in ldap_initialize () from /opt/local/lib/libldap-2.4.so.2 #7 0xfd3831a1 in zif_ldap_connect () from /opt/local/lib/php/20040412/ldap.so #8 0xfcbda874 in zend_do_fcall_common_helper_SPEC () from /opt/local/lib/httpd/mod_php5.so #9 0xfcbe1a23 in ZEND_DO_FCALL_SPEC_CONST_HANDLER () from /opt/local/lib/httpd/mod_php5.so #10 0xfcbd9e99 in execute () from /opt/local/lib/httpd/mod_php5.so #11 0xfcbda985 in zend_do_fcall_common_helper_SPEC () from /opt/local/lib/httpd/mod_php5.so #12 0xfcbdad65 in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER () from /opt/local/lib/httpd/mod_php5.so #13 0xfcbd9e99 in execute () from /opt/local/lib/httpd/mod_php5.so #14 0xfcbda985 in zend_do_fcall_common_helper_SPEC () from /opt/local/lib/httpd/mod_php5.so #15 0xfcbdad65 in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER () from /opt/local/lib/httpd/mod_php5.so #16 0xfcbd9e99 in execute () from /opt/local/lib/httpd/mod_php5.so ---Type <return> to continue, or q <return> to quit--- #17 0xfcbda985 in zend_do_fcall_common_helper_SPEC () from /opt/local/lib/httpd/mod_php5.so #18 0xfcbdad65 in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER () from /opt/local/lib/httpd/mod_php5.so #19 0xfcbd9e99 in execute () from /opt/local/lib/httpd/mod_php5.so #20 0xfcbda985 in zend_do_fcall_common_helper_SPEC () from /opt/local/lib/httpd/mod_php5.so #21 0xfcbdad65 in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER () from /opt/local/lib/httpd/mod_php5.so #22 0xfcbd9e99 in execute () from /opt/local/lib/httpd/mod_php5.so #23 0xfcbda985 in zend_do_fcall_common_helper_SPEC () from /opt/local/lib/httpd/mod_php5.so #24 0xfcbdad65 in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER () from /opt/local/lib/httpd/mod_php5.so #25 0xfcbd9e99 in execute () from /opt/local/lib/httpd/mod_php5.so #26 0xfcbda985 in zend_do_fcall_common_helper_SPEC () from /opt/local/lib/httpd/mod_php5.so #27 0xfcbdad65 in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER () from /opt/local/lib/httpd/mod_php5.so #28 0xfcbd9e99 in execute () from /opt/local/lib/httpd/mod_php5.so #29 0xfcbda985 in zend_do_fcall_common_helper_SPEC () from /opt/local/lib/httpd/mod_php5.so #30 0xfcbdad65 in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER () ---Type <return> to continue, or q <return> to quit--- from /opt/local/lib/httpd/mod_php5.so #31 0xfcbd9e99 in execute () from /opt/local/lib/httpd/mod_php5.so #32 0xfcbda985 in zend_do_fcall_common_helper_SPEC () from /opt/local/lib/httpd/mod_php5.so #33 0xfcbdad65 in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER () from /opt/local/lib/httpd/mod_php5.so #34 0xfcbd9e99 in execute () from /opt/local/lib/httpd/mod_php5.so #35 0xfcbda985 in zend_do_fcall_common_helper_SPEC () from /opt/local/lib/httpd/mod_php5.so #36 0xfcbdad65 in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER () from /opt/local/lib/httpd/mod_php5.so #37 0xfcbd9e99 in execute () from /opt/local/lib/httpd/mod_php5.so #38 0xfcbbebaa in zend_execute_scripts () from /opt/local/lib/httpd/mod_php5.so #39 0xfcb7f40e in php_execute_script () from /opt/local/lib/httpd/mod_php5.so #40 0xfcc509ca in php_handler () from /opt/local/lib/httpd/mod_php5.so #41 0x08085c2a in ap_run_handler () #42 0x0808638e in ap_invoke_handler () #43 0x08094ca7 in ap_internal_redirect () #44 0xfe48c232 in handler_redirect () from /opt/local/lib/httpd/mod_rewrite.so #45 0x08085c2a in ap_run_handler () #46 0x0808638e in ap_invoke_handler () #47 0x08094471 in ap_process_request () #48 0x0809177c in ap_process_http_connection () ---Type <return> to continue, or q <return> to quit--- #49 0x0808d426 in ap_run_process_connection () #50 0x0808d858 in ap_process_connection () #51 0x08099e89 in child_main () #52 0x08099f65 in make_child () #53 0x0809a472 in ap_mpm_run () #54 0x080709ab in main () (gdb)
Update 2:
From what I can say, the problem starts in these two function calls:
#3 0xfde3f78b in ldap_free_urldesc () from /usr/lib/libldap.so.5
The function from # 4 (ldap_free_urllist) is called from the library in / opt / local / lib / libldap -2.4.so.2, and # 3 is called from the library in /usr/lib/libldap.so.5, I don’t know enough to to say whether this is normal or not, but I would suggest that it is not. Thus, somehow both LDAP libraries are loaded.